libffi for cedar attempt

builds/libraries/libffi

+#!/usr/bin/env bash
+# Build Path: /app/.heroku/python/
+
+OUT_PREFIX=$1
+
+# Use new path, containing autoconf.
+export PATH="/app/.heroku/python/bin/:$PATH"
+hash -r
+
+
+echo "Building libffi..."
+
+SOURCE_TARBALL='http://cl.ly/2s1t1u3v0N0I/download/libffi-3.1.tar'
+
+curl -L $SOURCE_TARBALL | tar x
+
+cd libffi-3.1
+./configure --prefix=$OUT_PREFIX --disable-static &&
+make
+make install
+
+# Cleanup
+cd ..